| 摘要 |
PROBLEM TO BE SOLVED: To remove coloring substances at a high efficiency from a colored gas oil component and to thereby obtain a good-hue low-sulfur gas oil at a low cost by bringing a colored gas oil component desulfurized to a specified sulfur content or lower by a hydrodesulfurization process into contact with activated coal having a specified mean pore diameter. SOLUTION: A gas oil component, such as straight-run gas oil, catalytically cracked oil, thermally cracked gas oil, or vacuum-distilled gas oil, deeply desulfurized to a sulfur content of 0.05 mass % or below by a hydrodesulfurization process and having a boiling range of 150-450 deg.C is brought into contact with activated coal having a mean pore diameter of 100-11,000Å. The conditions for the contact desirably include a hydrogen pressure of 0.1-4.9 MPa, a temperature of 0-400 deg.C, and a liquid hourly space velocity of 0-20 /h. The activated coal used is exemplified by one made by using wood, waste plastics, coal, petroleum heavy oil, or petroleum- or coal-derived pitch as a starting material and is desirably one containing 10 mass % or below inorganic component impurities. It is desirably a formed one in a columnar, four-leaf, spherical, or like form.
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